Powerful toxins = lethal dose is defined as the amount in milligrams needed to kill 50 percent of the animals tested.

1) Anthrax 0.0002
2) Cone shell 0.004
3) Textrodoxotine in the blue ring octopus and puffer fish 0.008
4) Inland taipan snake 0.025
5) Eastern brown snake 0.036
6) Dubois’s sea snake 0.044
7) Coastal taipan snake 0.105
8) Beaked sea snake 0.113
9) Western tiger snake 0.194
10) Mainland tiger snake 0.214
11) Common death adder 0.500